See also:

Switching on automatically
Select transmission position R with the engine running. The Top View and PDC images are displayed if the system is switched on via iDrive. ...

Controls
Controls 1 Volume, on/off 2 Eject CD/DVD 3 CD/DVD drive 4 Change the entertainment source 5 Change station/track 6 Programmable memory buttons ...

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...